[PATCH v4 5/8] media: staging/imx: Remove capture_device_set_format

[Steve Longerbeam]

Don't propagate the source pad format to the connected capture device.
It's now the responsibility of userspace to call VIDIOC_S_FMT on the
capture device to ensure the capture format and compose rectangle
are compatible with the connected source. To check this, validate
the capture format with the source before streaming starts.

Signed-off-by: Steve Longerbeam <slongerbeam@xxxxxxxxx>
---
Changes in v4:
- add **cc arg to __capture_try_fmt_vid_cap() to validate colorspace,
  instead of calling ipu_pixelformat_to_colorspace().
- add error message if capture format validation failed.
---
 drivers/staging/media/imx/imx-ic-prpencvf.c   | 16 +----
 drivers/staging/media/imx/imx-media-capture.c | 71 +++++++++++++------
 drivers/staging/media/imx/imx-media-csi.c     | 16 +----
 drivers/staging/media/imx/imx-media.h         |  2 -
 drivers/staging/media/imx/imx7-media-csi.c    | 17 +----
 5 files changed, 55 insertions(+), 67 deletions(-)

diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c b/drivers/staging/media/imx/imx-ic-prpencvf.c
index afaa3a8b15e9..63334fd61492 100644
--- a/drivers/staging/media/imx/imx-ic-prpencvf.c
+++ b/drivers/staging/media/imx/imx-ic-prpencvf.c
@@ -906,9 +906,7 @@ static int prp_set_fmt(struct v4l2_subdev *sd,
 		       struct v4l2_subdev_format *sdformat)
 {
 	struct prp_priv *priv = sd_to_priv(sd);
-	struct imx_media_video_dev *vdev = priv->vdev;
 	const struct imx_media_pixfmt *cc;
-	struct v4l2_pix_format vdev_fmt;
 	struct v4l2_mbus_framefmt *fmt;
 	int ret = 0;
 
@@ -945,19 +943,9 @@ static int prp_set_fmt(struct v4l2_subdev *sd,
 			priv->cc[PRPENCVF_SRC_PAD] = outcc;
 	}
 
-	if (sdformat->which == V4L2_SUBDEV_FORMAT_TRY)
-		goto out;
-
-	priv->cc[sdformat->pad] = cc;
+	if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+		priv->cc[sdformat->pad] = cc;
 
-	/* propagate output pad format to capture device */
-	imx_media_mbus_fmt_to_pix_fmt(&vdev_fmt,
-				      &priv->format_mbus[PRPENCVF_SRC_PAD],
-				      priv->cc[PRPENCVF_SRC_PAD]);
-	mutex_unlock(&priv->lock);
-	imx_media_capture_device_set_format(vdev, &vdev_fmt);
-
-	return 0;
 out:
 	mutex_unlock(&priv->lock);
 	return ret;
diff --git a/drivers/staging/media/imx/imx-media-capture.c b/drivers/staging/media/imx/imx-media-capture.c
index 555f6204660b..8a908c3e5e60 100644
--- a/drivers/staging/media/imx/imx-media-capture.c
+++ b/drivers/staging/media/imx/imx-media-capture.c
@@ -205,7 +205,9 @@ static int capture_g_fmt_vid_cap(struct file *file, void *fh,
 
 static int __capture_try_fmt_vid_cap(struct capture_priv *priv,
 				     struct v4l2_subdev_format *fmt_src,
-				     struct v4l2_format *f)
+				     struct v4l2_format *f,
+				     const struct imx_media_pixfmt **retcc,
+				     struct v4l2_rect *compose)
 {
 	const struct imx_media_pixfmt *cc, *cc_src;
 
@@ -247,6 +249,16 @@ static int __capture_try_fmt_vid_cap(struct capture_priv *priv,
 
 	imx_media_mbus_fmt_to_pix_fmt(&f->fmt.pix, &fmt_src->format, cc);
 
+	if (retcc)
+		*retcc = cc;
+
+	if (compose) {
+		compose->left = 0;
+		compose->top = 0;
+		compose->width = fmt_src->format.width;
+		compose->height = fmt_src->format.height;
+	}
+
 	return 0;
 }
 
@@ -263,7 +275,7 @@ static int capture_try_fmt_vid_cap(struct file *file, void *fh,
 	if (ret)
 		return ret;
 
-	return __capture_try_fmt_vid_cap(priv, &fmt_src, f);
+	return __capture_try_fmt_vid_cap(priv, &fmt_src, f, NULL, NULL);
 }
 
 static int capture_s_fmt_vid_cap(struct file *file, void *fh,
@@ -284,17 +296,12 @@ static int capture_s_fmt_vid_cap(struct file *file, void *fh,
 	if (ret)
 		return ret;
 
-	ret = __capture_try_fmt_vid_cap(priv, &fmt_src, f);
+	ret = __capture_try_fmt_vid_cap(priv, &fmt_src, f, &priv->vdev.cc,
+					&priv->vdev.compose);
 	if (ret)
 		return ret;
 
 	priv->vdev.fmt.fmt.pix = f->fmt.pix;
-	priv->vdev.cc = imx_media_find_format(f->fmt.pix.pixelformat,
-					      CS_SEL_ANY, true);
-	priv->vdev.compose.left = 0;
-	priv->vdev.compose.top = 0;
-	priv->vdev.compose.width = fmt_src.format.width;
-	priv->vdev.compose.height = fmt_src.format.height;
 
 	return 0;
 }
@@ -524,6 +531,33 @@ static void capture_buf_queue(struct vb2_buffer *vb)
 	spin_unlock_irqrestore(&priv->q_lock, flags);
 }
 
+static int capture_validate_fmt(struct capture_priv *priv)
+{
+	struct v4l2_subdev_format fmt_src;
+	const struct imx_media_pixfmt *cc;
+	struct v4l2_rect compose;
+	struct v4l2_format f;
+	int ret;
+
+	fmt_src.pad = priv->src_sd_pad;
+	fmt_src.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+	ret = v4l2_subdev_call(priv->src_sd, pad, get_fmt, NULL, &fmt_src);
+	if (ret)
+		return ret;
+
+	v4l2_fill_pix_format(&f.fmt.pix, &fmt_src.format);
+
+	ret = __capture_try_fmt_vid_cap(priv, &fmt_src, &f, &cc, &compose);
+	if (ret)
+		return ret;
+
+	return (priv->vdev.fmt.fmt.pix.width != f.fmt.pix.width ||
+		priv->vdev.fmt.fmt.pix.height != f.fmt.pix.height ||
+		priv->vdev.cc->cs != cc->cs ||
+		priv->vdev.compose.width != compose.width ||
+		priv->vdev.compose.height != compose.height) ? -EINVAL : 0;
+}
+
 static int capture_start_streaming(struct vb2_queue *vq, unsigned int count)
 {
 	struct capture_priv *priv = vb2_get_drv_priv(vq);
@@ -531,6 +565,12 @@ static int capture_start_streaming(struct vb2_queue *vq, unsigned int count)
 	unsigned long flags;
 	int ret;
 
+	ret = capture_validate_fmt(priv);
+	if (ret) {
+		v4l2_err(priv->src_sd, "capture format not valid\n");
+		goto return_bufs;
+	}
+
 	ret = imx_media_pipeline_set_stream(priv->md, &priv->src_sd->entity,
 					    true);
 	if (ret) {
@@ -654,19 +694,6 @@ static struct video_device capture_videodev = {
 	.device_caps	= V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING,
 };
 
-void imx_media_capture_device_set_format(struct imx_media_video_dev *vdev,
-					 struct v4l2_pix_format *pix)
-{
-	struct capture_priv *priv = to_capture_priv(vdev);
-
-	mutex_lock(&priv->mutex);
-	priv->vdev.fmt.fmt.pix = *pix;
-	priv->vdev.cc = imx_media_find_format(pix->pixelformat, CS_SEL_ANY,
-					      true);
-	mutex_unlock(&priv->mutex);
-}
-EXPORT_SYMBOL_GPL(imx_media_capture_device_set_format);
-
 struct imx_media_buffer *
 imx_media_capture_device_next_buf(struct imx_media_video_dev *vdev)
 {
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 09b89a72eaa2..68c2b1a3066a 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -1506,10 +1506,8 @@ static int csi_set_fmt(struct v4l2_subdev *sd,
 		       struct v4l2_subdev_format *sdformat)
 {
 	struct csi_priv *priv = v4l2_get_subdevdata(sd);
-	struct imx_media_video_dev *vdev = priv->vdev;
 	struct v4l2_fwnode_endpoint upstream_ep = { .bus_type = 0 };
 	const struct imx_media_pixfmt *cc;
-	struct v4l2_pix_format vdev_fmt;
 	struct v4l2_mbus_framefmt *fmt;
 	struct v4l2_rect *crop, *compose;
 	int ret;
@@ -1561,19 +1559,9 @@ static int csi_set_fmt(struct v4l2_subdev *sd,
 		}
 	}
 
-	if (sdformat->which == V4L2_SUBDEV_FORMAT_TRY)
-		goto out;
-
-	priv->cc[sdformat->pad] = cc;
+	if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+		priv->cc[sdformat->pad] = cc;
 
-	/* propagate IDMAC output pad format to capture device */
-	imx_media_mbus_fmt_to_pix_fmt(&vdev_fmt,
-				      &priv->format_mbus[CSI_SRC_PAD_IDMAC],
-				      priv->cc[CSI_SRC_PAD_IDMAC]);
-	mutex_unlock(&priv->lock);
-	imx_media_capture_device_set_format(vdev, &vdev_fmt);
-
-	return 0;
 out:
 	mutex_unlock(&priv->lock);
 	return ret;
diff --git a/drivers/staging/media/imx/imx-media.h b/drivers/staging/media/imx/imx-media.h
index ddea972b7bc4..f928697b0491 100644
--- a/drivers/staging/media/imx/imx-media.h
+++ b/drivers/staging/media/imx/imx-media.h
@@ -278,8 +278,6 @@ int imx_media_capture_device_register(struct imx_media_video_dev *vdev);
 void imx_media_capture_device_unregister(struct imx_media_video_dev *vdev);
 struct imx_media_buffer *
 imx_media_capture_device_next_buf(struct imx_media_video_dev *vdev);
-void imx_media_capture_device_set_format(struct imx_media_video_dev *vdev,
-					 struct v4l2_pix_format *pix);
 void imx_media_capture_device_error(struct imx_media_video_dev *vdev);
 
 /* subdev group ids */
diff --git a/drivers/staging/media/imx/imx7-media-csi.c b/drivers/staging/media/imx/imx7-media-csi.c
index e2622c05a793..0ec4c57259f9 100644
--- a/drivers/staging/media/imx/imx7-media-csi.c
+++ b/drivers/staging/media/imx/imx7-media-csi.c
@@ -1031,10 +1031,8 @@ static int imx7_csi_set_fmt(struct v4l2_subdev *sd,
 			    struct v4l2_subdev_format *sdformat)
 {
 	struct imx7_csi *csi = v4l2_get_subdevdata(sd);
-	struct imx_media_video_dev *vdev = csi->vdev;
 	const struct imx_media_pixfmt *outcc;
 	struct v4l2_mbus_framefmt *outfmt;
-	struct v4l2_pix_format vdev_fmt;
 	const struct imx_media_pixfmt *cc;
 	struct v4l2_mbus_framefmt *fmt;
 	struct v4l2_subdev_format format;
@@ -1079,19 +1077,8 @@ static int imx7_csi_set_fmt(struct v4l2_subdev *sd,
 			csi->cc[IMX7_CSI_PAD_SRC] = outcc;
 	}
 
-	if (sdformat->which == V4L2_SUBDEV_FORMAT_TRY)
-		goto out_unlock;
-
-	csi->cc[sdformat->pad] = cc;
-
-	/* propagate output pad format to capture device */
-	imx_media_mbus_fmt_to_pix_fmt(&vdev_fmt,
-				      &csi->format_mbus[IMX7_CSI_PAD_SRC],
-				      csi->cc[IMX7_CSI_PAD_SRC]);
-	mutex_unlock(&csi->lock);
-	imx_media_capture_device_set_format(vdev, &vdev_fmt);
-
-	return 0;
+	if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+		csi->cc[sdformat->pad] = cc;
 
 out_unlock:
 	mutex_unlock(&csi->lock);
-- 
2.17.1